"Two songs with overtone techniques : a) in the style umngqokolo ngomqangi by Nowayilethi Mbizweni ; b) "ordinary" umngqokolo by Nowayilethi Mbizweni (principal voice) and Nofirst Lungisa (seconclary voice). The two pieces have the same title : Nondel ekhaya, "Married at home" (compare the previous track on the musical bow).
a) Nowayilethi Mbizweni says she invented the umngokolo ngomqangi style by being inspired by the buzzing of a beetle held in front of her mouth, with selection of harmonics in the buccal cavity (this technique also being used in Papua New Guinea, compare track 55). The lips in position for an [o], she sounds two fundamentals with a very low voice :an A with harmonics 4, 5 and 6, and the B with harmonics 3, 4 and 5. See the sonagram, figure 13.
b) In the style of "ordinary" umngqokolo, the tongue is laced in the front of the mouth while the lips remain more open than in a). At the beginning of the piece, the second woman sings in a natural voice, before takin up the same overtone technique. The two women sing at the unison on three fundamental pitches : the F with harmonics 5 and 6, the G with harmonies 4 and 5, the D with harmonic 3.
Music for diversion."